<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<h3>身体质量测试</h3>
<form action="/bmi1">
  <input type="text" name="height" placeholder="身高">
  <input type="text" name="weight" placeholder="体重">
  <input type="submit">
</form>

</body>
</html>